Spring MVC @PathVariable dot (.) get truncated

Review a Spring MVC @RequestMapping and @PathVariable example.

@RequestMapping("/site")
public class SiteController {
    @RequestMapping(value = "/{q}", method = RequestMethod.GET)
    public ModelAndView display(@PathVariable("q") String q) {
        logger.debug("Site : q : {}", q);
        return getModelAndView(q, "site");
//...

See the following cases :

1. For input /site/google, “q” will display google
2. For input /site/google.com, “q” will still display google, the dot (.) is truncated!?
3. For input /site/google.com.my, “q” will display google.com, the last dot (.) is truncated!
4. For input /site/google.com.my.abc, “q” will display google.com.my
5. For input /site/cloud.google.com, “q” will display cloud.google

The last dot (.) is always getting truncated.

Solution

To fix it, add a regex mapping {q:.+} in @RequestMapping

@RequestMapping("/site")
public class SiteController {
    @RequestMapping(value = "/{q:.+}", method = RequestMethod.GET)
    public ModelAndView display(@PathVariable("q") String q) {
        logger.debug("Site : q : {}", q);
        return getModelAndView(q, "site");
//...

Now, for input /site/google.com, “q” will display the correct google

References

1. Spring Doc – URI Template Patterns with Regular Expressions